Amazon was the cheapest, but you also can order the book from Walmart.com, Target.com, BarnesandNoble.com, Borders.com, Books-a-million.com, iBooks or any other retailer. Then, forward your order confirmation e-mail to TheWaterSecretOffer@murad.com and the company will ship out your free products in two to four weeks.

Click here for the deal. The offer expires on Jan. 31 or while supplies last. I wouldn't wait!